Identical Calendar Years

Gregorian Calendars have fourteen arrangements of dates on days of weekly cycles. There’s one for each day of the week that begins common years and one for each day of the week that begins leap years.
Each of these fourteen arrangements repeat every 28 years as long as every fourth year has a 29-day February. This is the case within every century, and for two consecutive centuries if the second of them begins on an intercalary year.
During those time frames the repetitions are not only every 28 years—common year calendars also repeat after each six or eleven years in similar sequences with either 6-11-11, 11-6-11 or 11-11-6 years between them. A.D. numbers of repeating years that cycle thru those patterns for two centuries are shown in the table below.

Repeating Calendar Years for 1901 thru 2099

Common-year calendar rows have a tan background.Leap year rows have a light blue background.
Each day of the week is followed in its rows by all year numbers from 1901 thru 2099 whose January 1st is on that day.
Column headings of + 6 or + 11 indicate the number of years following the prior identical calendar year.

Sunday’s cycle:

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

Sunday

1905

1911

1922

1933

1939

1950

1961

1967

1978

1989

1995

2006

2017

2023

2034

2045

2051

2062

2073

2079

2090

n/a

Sunday

1928

1956

1984

2012

2040

2068

2096

Monday’s cycle:

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

Monday*

1906

1917

1923

1934

1945

1951

1962

1973

1979

1990

2001

2007

2018

2029

2035

2046

2057

2063

2074

2085

2091

n/a

Monday

1912

1940

1968

1996

2024

2052

2080

Tuesday’s cycle:

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

Tuesday

1901

1907

1918

1929

1935

1946

1957

1963

1974

1985

1991

2002

2013

2019

2030

2041

2047

2058

2069

2075

2086

2097

Tuesday

1924

1952

1980

2008

2036

2064

2092

Wednesday’s cycle:

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

Wednesday

1902

1913

1919

1930

1941

1947

1958

1969

1975

1986

1997

2003

2014

2025

2031

2042

2053

2059

2070

2081

2087

2098

Wednesday

1908

1936

1964

1992

2020

2048

2076

Thursday’s cycle:

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

Thursday

1903

1914

1925

1931

1942

1953

1959

1970

1981

1987

1998

2009

2015

2026

2037

2043

2054

2065

2071

2082

2093

2099

Thursday

1920

1948

1976

2004

2032

2060

2088

Friday’s cycle:

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

Friday

1909

1915

1926

1937

1943

1954

1965

1971

1982

1993

1999

2010

2021

2027

2038

2049

2055

2066

2077

2083

2094

n/a

Friday

1904

1932

1960

1988

2016

2044

2072

**

Saturday’s cycle:

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

+ 11

+ 6

+ 11

Saturday

1910

1921

1927

1938

1949

1955

1966

1977

1983

1994

2005

2011

2022

2033

2039

2050

2061

2067

2078

2089

2095

n/a

Saturday

1916

1944

1972

2000

2028

2056

2084

Notes:* 1900 also began on Monday but it doesn’t fit into that day’s common year 1906 thru 2091 repetition pattern of 11-6-11.** 2100 will begin on Friday but it is a common year.

Table year numbers stop at 2099 because that’s where the repeating cycles of number of years between identical calendars for these two centuries end. However, those same patterns for time spans between identical years will begin again starting with 2101. All but two days of the week will have a different common year cycle pattern than they had from 1901 thru 2099.
Even though 1900 and 2100 are not included in this page’s table showing common year patterns of years between them, they are separated both before and after by 6 years from their nearest identical year.